Phonograph motor



1 March 25, 1924. 1,487,913 P.P. BELT PHONOGRAPH MOTOR Filed June 10 1921 2 Sheets-Sheet 1 Prlqyfffieli.

A 770mm J;

March 25, 1924. 1,487,913

I P. P. BELT Y 'PHONOGRAPH MOTOR Filed June 10 1921 2 Sheets-Sheet 2 l wit Patented Mar. 25, 1924.

PATENT OFFICE.

PEBLEY P. BELT, OF

IREDONIA, KANSAS.

I PHONOGBAPH MOTOR.

Application filed June 10,

To all whom it may concern:

Be it known that I, PERLEY P. BELT, a citizen of the United States, residin at Fredonia, in the county of Wilson and btate I of Kansas, have invented certain new and useful Improvements in Phono raph Motors; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked t ereon, which form a part of this specification.

This invention relates to phonograph motors and articularly to a motor for rotating a turntab e used for disk records.

One of the objects of the invention is to provide a motor which will be ractically silent while it is operating, it being one of the purposes of the invention to maintain a slow rotative speed of the operatin mechanism or in other words, to control t e motor so as to maintain the speed of the turntable within practicallimits.

In actual practice I have found that a rin -sha d magnet may be efliciently utilize to rive a ring-shaped armature. The rin -shaped armature is preferably formed strands or laminations of wire about its imeter and the magnet is preferably wit in the perimeter of the armature and formed with laminations having radial pole pieces which may be connected in series by 5 an approved form of windin It is also to be noted that t e ring-shaped ma et may have any number of polar projection that the armature or rotating ele-. ment 0 the motor may be made of an appropriate form; that it may consist o -copor or aluminum, that a channel is provided or the strands or laminations of wire and thatthe channel may also consist of any suitable material.

There are other novel details of constructhe following description in connection with W the accompanying drawings, in which F' 1 is a perspective view" of a phonograph motor constructed in accordance with my invention.

Fi 2 is a plan view of the motor, the

I soun reproducing horn or tube being shown 1921. semi No. 470,470.

I in section and parts of the turntable being 1 designates a base of any appropriate construction having a standard 2 with a central, longitudinal opening 3 therein to receive a socket member or sleeve 4, in the bottom of which is an adjustable bearin plug 5, carrying a bearing ball 6 on whic rests the end 7 of a vertical rotatable shaft 8, the diameter of'whichis less than the inner diameter of the'sleeve 4. The shaft 8 carries a bearing collar 9, between which and a bearing ring 10 in the socket 11 of the sleeve 4 are bearing balls 12, which space the shaft 8 away from the sides of the sleeve 4 and which cooperate with the ball 7 in reducin' the friction of the shaft, it bein observe by reference to Fig. 3 that the am ing rings 9 and 10 are above the floor of the recess and that they may be held in such po sition b adjusting the plug 5.

The s eeve 4 carries two sets of diametrically opposite arms 13 and 14 and 13 and 14, havmg upstanding ends 15 and 16, to which are secured the rin -shaped laminati0ns17, which constitute tie magnet and it will be observed that the laminations are provided with pairs of radial offset pole pieces, those in each pair being designated 18 and 19 respectively, the one designated 19 being provided with a copper sleeve 20.

The ole pieces are wound in multiple series, t e winding wire 21, for, example,

rent. The ring-shaped magnet is supported pended from the disk, magnetic material within the annulus, a circular ma net within the space confined by the annu us having pole pieces adjacent thereto and braking means carried by the turntable and movable into functional position in response to the speed thereof. Y

3. A phonograph motor comprising an armature support, ring shaped laminations 10 on said support, having paired, radial, oil'- set pole pieces, coils on said pole pieces wound in multiple series, one of the pole pieces in each pair being sleeved to form a shaded pole magnet, a shaft revoluble in said base, a turntable on said shaft, a channel shaped annulus suspended from the turntable and surroundin the magnet and an armature coil in said 0 annel.

In testimony whereof I afiix m signature.

PERLEY BELT. 

